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11 Arietis


Dec 16, 2021

11 Arietis (abbreviated 11 Ari) is a star in the northern constellation of Aries. 11 Arietis is the Flamsteed designation. It has an apparent visual magnitude of 6.01,[2] which makes it a challenging target to view with the naked eye in suitably dark skies. Based upon an annual parallax shift of 3.72 mas,[1] the distance to this star is approximately 880 light-years (270 parsecs).

Star in the Aries constellation

11 Arietis
Observation data
Epoch J2000      Equinox J2000
Constellation Aries
Right ascension 02h 06m 49.23558s[1]
Declination +25° 42 16.3939[1]
Apparent magnitude (V) 6.01[2]
Spectral type B9 IV-Vn[3]
U−B color index –0.26[4]
B−V color index –0.04[4]
Radial velocity(Rv) –9[5] km/s
Proper motion(μ) RA: +19.46[1] mas/yr
Dec.: –14.31[1] mas/yr
Parallax(π) 3.72 ± 0.38[1] mas
Distance approx. 880 ly
(approx. 270 pc)
Radius 2.8[6] R
Rotational velocity(v sin i) 249[7] km/s
Other designations
BD+25° 349, HD 12885, HIP 9859, HR 615, SAO 75149.[8]
Database references

11 Arietis has a stellar classification of B9 IV-Vn,[3] which may indicate that it is beginning to evolve away from the main sequence into a subgiant as the supply of hydrogen at its core becomes exhausted. At present it has an estimated 2.8[6] times the radius of the Sun, but this will increase as it continues to evolve into a giant star. 11 Arietis is spinning rapidly with a projected rotational velocity of 249 km/s.[7] This motion, combined with the Doppler effect, is causing the absorption lines in the spectrum to spread out and become ‘nebulous’, as indicated by the ‘n’ suffix in the classification.

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  1. van Leeuwen, F. (November 2007), “Validation of the new Hipparcos reduction”, Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A…474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
  2. Høg, E.; et al. (March 2000), “The Tycho-2 catalogue of the 2.5 million brightest stars”, Astronomy and Astrophysics, 355: L27–L30, Bibcode:2000A&A…355L..27H, doi:10.1888/0333750888/2862.
  3. Cowley, A. (November 1972), “Spectral classification of the bright B8 stars”, Astronomical Journal, 77: 750–755, Bibcode:1972AJ…..77..750C, doi:10.1086/111348.
  4. Crawford, D. L. (February 1963), “U, b, v, and Hβ Photometry for the Bright B8- and B9-TYPE Stars”, Astrophysical Journal, 137: 530, Bibcode:1963ApJ…137..530C, doi:10.1086/147526.
  5. Wilson, Ralph Elmer (1953), “General Catalogue of Stellar Radial Velocities”, Carnegie Institute Washington D.C. Publication, Washington: Carnegie Institution of Washington, Bibcode:1953GCRV..C……0W.
  6. Pasinetti Fracassini, L. E.; et al. (February 2001), “Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) – Third edition – Comments and statistics”, Astronomy and Astrophysics, 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A…367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
  7. Royer, F.; Zorec, J.; Gómez, A. E. (February 2007), “Rotational velocities of A-type stars. III. Velocity distributions”, Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A…463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
  8. “11 Ari”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-07-18.CS1 maint: postscript (link)

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